In which of the following is the atrial rate faster than the ventricular rate?
1. Atrial fibrillation
2. Sinus bradycardia
3. Atrial flutter
4. Sinus tachycardia
a. 1, 3
b. 2, 4
c. 3, 4
d. 1, 2, 3
A
Atrial fibrillation and atrial flutter both involve an abnormally fast atrial depolarization rate, while the ventricular rate is less than the atrial rate. Sinus bradycardia is a heart rate of less than 60 bpm. Sinus tachycardia is a very fast ventricular rate that matches the atrial rate.
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